Feeding mechanism for sewing-machines.



PATENTED AUG. 13, 1907.

' M. HBMLEB. .FEBDING MECHANISM FOR SEWING MACHINES.

APPLICATION FILED JULY 11, 1906.

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UNITED STATES PATENT OFFICE,

MARTIN HEMLEB, OF ELIZABETH, NEW JERSEY, ASSIGNOR TO THE SINGER MANUFAC- TURING COMPANY, A CORPORATION OF NEW JERSEY.

FEEDING MECHANISM FOR SEWING-MACHINES.

Specification of Letters Patent.

Patented Aug'. 13, 1907.

Application filed July 11,1906. Serial No. 325,576.

To all whom it may concern.-

Be it known that I, MARTIN HEMLEB, a citizen of the United States, residing at Elizabeth, in the county of Union, and State of New Jersey, have invented certain new and useful Improvements in Feeding Mechanism for Sewing-Machines, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to that class of feeding mechanism for sewing machines in which rising and falling movements are imparted to the feed-dog, and its object is to provide a simple and effective device for giving the feed-dog these rising and falling movements.

In the preferred embodiment of the present improvement the feed-bar carries the usual serrated feeding surface and is pivotally connected at one end with the usual feed-rocker deriving its oscillating movements from the main-shaft, While intermediate its ends it is provided in the lower side with a spherical socket en- 2 0 tered by the correspondingly shaped upper end of a supporting link whose similarly formed lower end rests within a spherical socket provided in the end of an adj ustable bearing-screw carried by a lifting arm deriving its rising and falling movements from a connection with the main-shaft. The opposite ends of the supporting link are maintained firmly seated in their sockets by means of a spring connecting the feedbar and liftingarm and tending to draw them togethenwhereby lost motion between the connected parts is prevented. The vertical adjustment of the bearing-screw in the lifting arm serves to vary the relation of the feeding surface carried by the feed-bar in respect of the throat-plate of the machine.

The present improvement will beunderstood by reference to the annexed drawings, in which Figure 1 is a transverse section of the rear portion of the bracket-arm of a well-known type of Singer sewing machine showing the operative connections between the main-shaft and the feed-actuating and feed-lifting rock-shafts; and Fig. 2 is a front end View of the lower portion of the sewing machine representing the feed-bar and the other members of the feed mechanism from which it derives its feeding and its rising and falling movements.

As represented in my United States Patent No. 809,945, dated Jan. 16, 1906, the frame of the machine is constructed with the usual bed-plate 1 and bracketarm 2 in which latter is journaled the driving-shaft 3 having eccentrics connected by rods 4 and 5 with lateral crank-arms 6 and 7, respectively, upon the feed-actuating and feed-lifting rock-shafts 8 and 9 mounted in suitable bearings beneath the bed-plate and arranged parallel with the longitudinally extending loop-taker actuatingshaft 10 carrying, in the present instance, the revolving hook 11. To the usual upwardly extended rocking-arms 12 at the forward end of the rock-shaft S is attached by means of the conical center-screws 13 one end of the feed-bar 14 provided at the opposite end with the usual feed-dog 15 and with a spherical socket 16 entered by the similarly formed upper end of the supporting link 17 whose spherical lower end enters a spherical socket 18 formed in the adjacent end of the bearingscrew 19 entering a vertically threaded hole 20 in the outer end of the lateral lifting-arm 21 extended from the forward end of the rock-shaft 9. A spring 22 connects the feed-dog with the lifting-arm and tends to draw them together so as to maintain the opposite ends of the supporting link 17 firmly seated in their respective sockets, thereby providing against lost motion between the connected parts, while the turning of the bearingscrew 19 after the preparatory loosening of its lock-nut 23 serves to effect the vertical adjustment of the work ing-position of the feed-dog 15 in respect of the liftingarm 21 and the throat-plate 24.

Among the advantages which are derived from the present improvement are, the certainty of action of the feed-dog by avoidance of lost motion in its connections with the feeding rock-shaft 9, and the avoidance of friction between the lifting member and the feed-dog due to the pivotal connection afforded by the link 17.

While the construction herein shown and described constitutes a preferred embodiment of the improvement, it is to be understood that the details are susceptible of material variation without departure from the spirit of the invention.

Having thus set forth the nature of my invention, what I claim herein is l. A feeding mechanism for sewing machines comprising a feed-rocker, means for imparting thereto its rocking movements, a lifting-arm having a socket, means for vibrating the same, a feed-bar having a socket and pivotally connected at one end with said feed-rocker, a food-dog mounted upon said feed-bar, and a link interposed between said lifting-arm and feed-bar with its ends seated in their respective sockets, one of said sockcts being adjustable in respect of its carrying member in a direction substantially lengthwise of said link.

2. A feedingmechanism for sewing machines comprising a feedrocker, means for imparting thereto its rocking; movements, at lifting-arm, means for vibrating the same, a feed-bar carrying a fccddog and pivotally connected at one end with said fecd-rocker and provided at its lower side with a spherical socket, an adjusting screw passingmovements. a lifting-arm, means for vibrating the same, said iiftingarm and feed-dog for maintaining the spherical 10 a feed-bar carrying a feed-dog and pivotally connected at ends of said link firmly seated in their respective sockets. one end with said feed-rocker and provided at its lower In testimony whereof, I have signed my name to this side with a spherical socket, an adjusting screw passing specification, in the presence of two subscribing Witnesses. through said lifting-arm in the direction of the feed-bar and provided in the end adjacent the latter with a spher- MARTIN HEMLEB. icai socket, a link having spherical ends interposed between Witnesses said feed-bar and adjusting screw with its ends entering HENRY J. MILLER,

the spherical sockets in the latter, and a spring connecting HENRY A. KORNRMANN. 

